The BMW 507 is arguably the most beautiful and certainly among the rarest production models ever to emerge from Munich, with only 253 produced between 1956 and 1959. The 507 was the first BMW built with a V8 engine and remained the only model to use one until the 740i debuted in 1992. The 3.2-liter pushrod V8 under the 507's bonnet was rated at either 150 or 160 horsepower.

Unfortunately, as attractive as the 507 was, its $10,000 price tag made it a bigger commercial failure than the more recent Z8. Following the 507's demise, BMW didn't build another roadster until the 1989 Z1.

This particular example appears to be in very good condition aside from its slightly foggy rear window. It spent a good part of its life at the Imperial Palace in Las Vegas, where it was purported to be one of two owned by Elvis Presley. As this is written, the $400,000 top bid has not cleared the reserve price, so you still have a chance to remortgage the house and get in on this action.